package com.tnovoselec.android.common.io.image;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
/**
 * Title: Framework <br />
 * Copyright: Copyright (c) 2011 <br />
 * 
 * The ImageUtil class can be used to make transformations on images. 
 * 
 * @author Tomislav Novoselec
 * @version 1.0.0
 * @since 1.0.0
 */
public class ImageUtil {

    private final static int reflectionGapDefault = 4;

    /**
     * 
     * @param originalBitmap
     * @return bitmap which is consisted of original Bitmap, reflected bitmap, and the gap between them with predefined value od 4pxs
     */
    public static Bitmap createBitmapWithReflection(Bitmap originalBitmap) {
	return createBitmapWithReflection(originalBitmap, reflectionGapDefault);
    }

    /**
     * 
     * @param originalBitmap
     * @param reflectionGap
     * @return bitmap which is consisted of original Bitmap, reflected bitmap, and the gap between them
     */
    public static Bitmap createBitmapWithReflection(Bitmap originalBitmap, int reflectionGap) {

	int width = originalBitmap.getWidth();
	int height = originalBitmap.getHeight();

	// This will not scale but will flip on the Y axis
	Matrix matrix = new Matrix();
	matrix.preScale(1, -1);

	// Create a Bitmap with the flip matrix applied to it.
	// We only want the bottom half of the image
	Bitmap reflectionImage = Bitmap.createBitmap(originalBitmap, 0, height / 2, width, height / 2, matrix, false);

	// Create a new bitmap with same width but taller to fit
	// reflection
	Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);

	// Create a new Canvas with the bitmap that's big enough for
	// the image plus gap plus reflection
	Canvas canvas = new Canvas(bitmapWithReflection);
	
	// Draw in the original image
	canvas.drawBitmap(originalBitmap, 0, 0, null);
	
	// Draw in the gap
	Paint deafaultPaint = new Paint();
	canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
	
	// Draw in the reflection
	canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

	// Create a shader that is a linear gradient that covers the
	// reflection
	Paint paint = new Paint();
	LinearGradient shader = new LinearGradient(0, originalBitmap.getHeight(), 0, bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
	
	// Set the paint to use this shader (linear gradient)
	paint.setShader(shader);
	
	// Set the Transfer mode to be porter duff and destination in
	paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
	
	// Draw a rectangle using the paint with our linear gradient
	canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);

	return bitmapWithReflection;

    }

}
